High modulus blue glass for infrared cut filter and method of making same

Abstract

The application relates to the technical field of optical glass, and particularly discloses high-modulus blue glass for an infrared cut-off filter and a preparation method thereof. The high-modulus blue glass provided by the application has excellent mechanical properties and visible light transmittance by optimizing the proportioning of raw materials. P2O5 serves as a glass network former, alkali metal oxides mainly play a network modifier function, Al2O3 serves as an intermediate oxide, [AlO4] tetrahedrons are formed to be embedded in the glass network, the hardness and scratch resistance of the material are significantly improved, the copper-zinc component can improve the transmittance of the glass material in the visible light range, and the composite addition and accurate proportioning of LiF and rare earth fluorides significantly improve the visible light transmittance and mechanical properties of the glass.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical glass, in particular to a high modulus blue glass for infrared cut-off filter and a preparation method thereof. BACKGROUND

[0002] With the iterative upgrade of optical technology, as the core component of optical path control, the performance of the filter directly determines the imaging accuracy and function realization of the optical system. The blue glass filter can accurately absorb the short-wavelength stray light in the ultraviolet to blue light band due to its unique borosilicate base material and transition metal doping technology, and can efficiently transmit the visible spectrum. This characteristic makes it irreplaceable in the fields of digital image, biological sensing and intelligent terminal. By suppressing infrared interference and light reflection effect, the material effectively solves the common phenomena of glare and ghosting in the camera module, and has become a key technology path to improve the color reproduction and contrast of CMOS image sensor.

[0003] However, the traditional blue glass filter is limited by the material composition and crystal phase structure, and its Vickers hardness is generally less than 600HV, and the bending strength is less than 200MPa. In the application scenarios of ultra-thinning and large target surface, it is easy to cause edge cracking and brittle fracture of the substrate. Especially in the curved surface bonding process and mechanical impact environment, the existing material is difficult to meet the strict requirements of mechanical stability of high-reliability camera modules, which seriously restricts its application in vehicle-mounted optics, medical endoscopes and other high-end fields.

[0004] For example, Chinese patent document CN 103058519 B discloses a thick piece blue glass formula for infrared cut-off filter, which comprises a glass network structure forming agent with a weight percentage of 50-70%, a weather-resistant stabilizer with a weight percentage of 8-22%, a glass stabilizer with a weight percentage of 0.3-3%, a softening stabilizer with a weight percentage of 10-25%, a defoaming clarifier with a weight percentage of 0-1.5%, a hardness improving stabilizer with a weight percentage of 2-10%, a fluxing agent with a weight percentage of 0-15%, and a near-infrared cut-off colorant with a weight percentage of 2.5-5%. The prepared blue glass has a visible light transmittance of more than 87%, an infrared light transmittance of less than 3% in the infrared light cut-off part, and can be stable for 1000h in an environment of temperature 85℃ and humidity 90%, but its mechanical properties still need to be further improved. SUMMARY

[0005] In view of the shortcomings of the prior art, the purpose of the present application is to provide a high modulus blue glass for infrared cut-off filter and a preparation method thereof.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The present application provides a high modulus blue glass for infrared cut-off filter, the high modulus blue glass comprises the following components by weight percentage:

[0008] P2O5 51.1-52.8%

[0009] K2O 7.2-7.7%

[0010] CaO 6.3-6.8%

[0011] MgO 6.1-7.1%

[0012] Na2O 5.8-6.4%

[0013] Al2O3 5.2-5.7%

[0014] CuO 3.2-4.6%

[0015] ZnO 3.0-3.8%

[0016] BaO 2.4-2.9%

[0017] Fluoride 5.8-6.9%;

[0018] In the technical solution disclosed by the present application, the weight percentage of P2O5 as a glass network former can be selected from 51.1%, 51.2%, 51.3%, 51.4%, 51.5%, 51.6%, 51.7%, 51.8%, 51.9%, 52.0%, 52.1%, 52.2%, 52.3%, 52.4%, 52.5%, 52.6%, 52.7%, 52.8%, but is not limited to the listed values, and other values not listed within the range are also applicable.

[0019] In the technical solution disclosed by the present application, K2O and Na2O as alkali metal oxides mainly play the function of network modifier, reducing the melting energy consumption by destroying the silicon-oxygen tetrahedral network, but excessive introduction will lead to the increase of thermal expansion coefficient and the decrease of chemical stability, so it needs to be controlled within a reasonable range.

[0020] The weight percentage of K2O can be selected from 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, 7.7%, but is not limited to the listed values, and other values not listed within the range are also applicable.

[0021] The weight percentage of Na2O can be selected from 5.8%, 5.9%, 6.0%, 6.1%, 6.2%, 6.3%, 6.4%, but is not limited to the listed values, and other values not listed within the range are also applicable.

[0022] In the disclosed technical solution, CaO and MgO are used as alkaline earth metal components, which mainly play the roles of adjusting the viscosity and crystallization of the glass. CaO can improve the anti-crystallization ability, and MgO can refine the crystal size to inhibit the expansion of micro-cracks.

[0023] The weight percentage of CaO can be selected as 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0024] The weight percentage of MgO can be selected as 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, 6.9%, 7.0%, 7.1%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0025] In the disclosed technical solution, Al2O3 is used as an intermediate oxide, which is embedded in the glass network by forming [AlO4] tetrahedron, significantly improving the hardness and scratch resistance of the material, and inhibiting the migration of alkali metal ions to enhance the environmental stability.

[0026] The weight percentage of Al2O3 can be selected as 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0027] In the disclosed technical solution, CuO is used as a colorant, which has d-d electron transition characteristics to give the glass selective absorption ability to blue-violet light. The weight percentage of CuO can be selected as 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0028] In the disclosed technical solution, ZnO can improve the transmittance of the glass material in the visible light range. The weight percentage of ZnO can be selected as 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0029] In the disclosed technical solution, the introduction of BaO can increase the density of the glass material to inhibit stress concentration, and its high polarization rate characteristics can also expand the infrared cutoff range. The weight percentage of BaO can be selected as 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0030] In the technical solution disclosed in the present application, the fluoride includes LiF, EuF3 and TbF3.

[0031] In the technical solution disclosed in the present application, LiF can reduce the glass melting temperature, promote the uniform distribution of components, reduce the bubble and crystallization tendency in the melting process, form a more homogeneous amorphous structure, and improve the light transmittance; meanwhile, Li + with a small radius (0.076 nm) can fill the glass network gap, reduce the free volume, make the connection of phosphorus oxygen tetrahedron (network skeleton formed by P2O5) more compact, and enhance the structure density compared with K + , Na + , and more easily embed the network gap, thereby enhancing the structure density, and thus improving the elastic modulus and hardness of the glass; after the rare earth fluoride (EuF3, TbF3) is added to the glass, Eu 3+ and Tb 3+ , with high charge density and network outer body characteristics, attract the surrounding phosphorus oxygen tetrahedron by Coulomb force, form an "ionic bridge" to enhance the network node connection, Li + , and the filling effect of Li + reduces the "hole" defects of the network gap, and the rare earth ions inhibit the movement of the network segment through the charge attraction, and the two work together to improve the elastic modulus and deformation resistance of the glass.

[0032] The weight percentage of LiF+EuF3+TbF3 can be selected from 5.8%, 5.9%, 6.0%, 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, 6.9%, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0033] In the technical solution disclosed in the present application, the weight ratio of LiF / (EuF3+TbF3) is limited to 2.7-4.5:1, and by controlling the weight ratio of LiF and (EuF3+TbF3) in the range of 2.7-4.5:1, the mechanical properties and visible light transmittance of the glass material can be optimized; if the amount of Li + breaks the continuity of P-O-P bond, resulting in excessive defects in the glass, and thus reducing the visible light transmittance and mechanical properties of the glass; if the rare earth fluoride is added too much, the dispersion of the rare earth ions becomes poor due to the excessive amount, and even agglomeration occurs, which produces a large number of small crystal nuclei or particles in the glass material, and when light passes through the glass, scattering occurs, thereby reducing the visible light transmittance, and the crystal nuclei or particles produced become stress concentration points, and the stress is easily accumulated at the points when the glass is subjected to external force, resulting in cracks and breakage, and reducing the hardness and mechanical properties of the glass.

[0034] The weight ratio of LiF / (EuF3+TbF3) can be selected from 2.7:1, 2.8:1, 2.9:1, 3.0:1, 3.1:1, 3.2:1, 3.3:1, 3.4:1, 3.5:1, 3.6:1, 3.7:1, 3.8:1, 3.9:1, 4.0:1, 4.1:1, 4.2:1, 4.3:1, 4.4:1, 4.5:1, but not limited to the listed values, and other values not listed in the value range are also applicable.

[0035] In the disclosed technical solution, the weight ratio of EuF3 / TbF3 is not particularly limited.

[0036] The application provides a preparation method of the high-modulus blue glass, comprising the following steps: mixing raw materials according to a formula, and then melting, clarifying, stirring and annealing to obtain the high-modulus blue glass.

[0037] In the disclosed technical solution, the melting temperature is 1350-1450℃, for example, 1350℃, 1360℃, 1370℃, 1380℃, 1390℃, 1400℃, 1410℃, 1420℃, 1430℃, 1440℃ or 1450℃; and the melting time is 25-40min, for example, 25min, 30min, 35min or 40min, but not limited to the listed values, and other values not listed in the value range are also applicable.

[0038] In the disclosed technical solution, the clarifying temperature is 1450-1480℃, for example, 1450℃, 1460℃, 1470℃ or 1480℃; and the clarifying time is 8-12h, for example, 8h, 9h, 10h, 11h or 12h, but not limited to the listed values, and other values not listed in the value range are also applicable.

[0039] In the disclosed technical solution, the stirring temperature is 1200-1300℃, for example, 1200℃, 1210℃, 1220℃, 1230℃, 1240℃, 1250℃, 1260℃, 1270℃, 1280℃, 1290℃ or 1300℃; and the stirring time is 8-12h, for example, 8h, 9h, 10h, 11h or 12h, but not limited to the listed values, and other values not listed in the value range are also applicable.

[0040] In the technical solution disclosed in the application, the annealing temperature is 460-560 DEG C, for example, 460 DEG C, 470 DEG C, 480 DEG C, 490 DEG C, 500 DEG C, 510 DEG C, 520 DEG C, 530 DEG C, 540 DEG C, 550 DEG C, 560 DEG C; the annealing time is 18-24h, for example, 18h, 19h, 20h, 21h, 22h, 23h, 24h, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0041] In the technical solution disclosed in the application, nitrogen is introduced to protect the furnace atmosphere during clarification and stirring.

[0042] The application also provides application of the high-modulus blue glass in preparation of an infrared cut-off filter.

[0043] Compared with the prior art, the application has the following beneficial effects:

[0044] The high-modulus blue glass provided by the application has excellent mechanical properties and visible light transmittance by optimizing the proportion of raw materials, wherein P2O5 serves as a glass network former, alkali metal oxides mainly serve as network adjusters, Al2O3 serves as an intermediate oxide, and the copper-zinc component can improve the transmittance of the glass material in the visible light range, the composite addition and accurate proportioning of LiF and rare earth fluoride significantly improve the visible light transmittance and mechanical properties of the glass; the component design of the application ensures the infrared cut-off efficiency, and through the mutual balance of various components, the material processing adaptability, surface hardness and mechanical properties are considered, and the application is suitable for precise optical lenses and other scenes with strict requirements on optical properties and mechanical strength. DETAILED DESCRIPTION

[0045] The application will be further described in detail through specific preferred embodiments, but the application is not limited to the following embodiments.

[0046] It should be noted that, unless otherwise specified, the chemical reagents involved in the application are purchased through commercial channels.

[0047] The glass component compositions in the examples and comparative examples of the application are shown in Table 1.

[0048] Table 1 Glass component composition table (wt%)

[0049]

[0050] Comparative Example 1 and Example 1, no EuF3+TbF3was added; Comparative Example 2 and Example 1, the weight ratio of LiF / (EuF3+TbF3) was 2:1; Comparative Example 3 and Example 1, the weight ratio of LiF / (EuF3+TbF3) was 4.9:1; Comparative Example 4 and Example 1, the weight ratio of LiF / (EuF3+TbF3) was 6.5:1.

[0051] Example 1

[0052] A method for preparing a high modulus blue glass, comprising the following steps:

[0053] S1, glass raw materials were weighed according to the glass component composition in Table 1 Example 1, and mixed uniformly;

[0054] S2, the uniformly mixed glass raw materials were placed in a kiln, heated to 1450℃ at a rate of 80℃ / h, and melted at 1450℃ for 30min to obtain molten glass;

[0055] S3, the molten glass was clarified under a nitrogen atmosphere at 1460℃ for 10h to obtain clarified glass;

[0056] S4, the clarified glass melt was stirred at a speed of 30r / min under a nitrogen atmosphere at 1250℃ for 12h, then the glass melt was poured into a graphite mold and quickly moved into an annealing furnace, and annealed at 500℃ for 24h to obtain a high modulus blue glass.

[0057] Example 2

[0058] A method for preparing a high modulus blue glass, comprising the following steps:

[0059] S1, glass raw materials were weighed according to the glass component composition in Table 1 Example 2, and mixed uniformly;

[0060] S2, the uniformly mixed glass raw materials were placed in a kiln, heated to 1450℃ at a rate of 80℃ / h, and melted at 1450℃ for 30min to obtain molten glass;

[0061] S3, the molten glass was clarified under a nitrogen atmosphere at 1460℃ for 10h to obtain clarified glass;

[0062] S4, the clarified glass melt was stirred at a speed of 30r / min under a nitrogen atmosphere at 1250℃ for 12h, then the glass melt was poured into a graphite mold and quickly moved into an annealing furnace, and annealed at 500℃ for 24h to obtain a high modulus blue glass.

[0063] Example 3

[0064] A preparation method of high modulus blue glass comprises the following steps:

[0065] S1, glass raw materials are weighed according to the glass component composition in Table 1 Example 3, and mixed uniformly;

[0066] S2, the uniformly mixed glass raw materials are placed in a kiln, heated to 1450 DEG C at a speed of 80 DEG C / h, and melted at 1450 DEG C for 30 min to obtain molten glass;

[0067] S3, the molten glass is clarified at 1460 DEG C for 10 h in a nitrogen atmosphere to obtain clarified glass;

[0068] S4, the clarified glass melt is stirred at 1250 DEG C at a speed of 30 r / min for 12 h in a nitrogen atmosphere, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace, and annealed at 500 DEG C for 24 h to obtain high modulus blue glass.

[0069] Example 4

[0070] A preparation method of high modulus blue glass comprises the following steps:

[0071] S1, glass raw materials are weighed according to the glass component composition in Table 1 Example 4, and mixed uniformly;

[0072] S2, the uniformly mixed glass raw materials are placed in a kiln, heated to 1450 DEG C at a speed of 80 DEG C / h, and melted at 1450 DEG C for 30 min to obtain molten glass;

[0073] S3, the molten glass is clarified at 1460 DEG C for 10 h in a nitrogen atmosphere to obtain clarified glass;

[0074] S4, the clarified glass melt is stirred at 1250 DEG C at a speed of 30 r / min for 12 h in a nitrogen atmosphere, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace, and annealed at 500 DEG C for 24 h to obtain high modulus blue glass.

[0075] Example 5

[0076] A preparation method of high modulus blue glass comprises the following steps:

[0077] S1, glass raw materials are weighed according to the glass component composition in Table 1 Example 5, and mixed uniformly;

[0078] S2, the uniformly mixed glass raw materials are placed in a kiln, heated to 1450 DEG C at a speed of 80 DEG C / h, and melted at 1450 DEG C for 30 min to obtain molten glass;

[0079] S3, the molten glass is clarified under the condition of nitrogen atmosphere and 1460℃ for 10h to obtain clarified glass;

[0080] S4, the clarified glass melt is stirred at the speed of 30r / min under the condition of nitrogen atmosphere and 1250℃ for 12h, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace to be annealed at 500℃ for 24h to obtain high modulus blue glass.

[0081] Example 6

[0082] A method for preparing high modulus blue glass comprises the following steps:

[0083] S1, glass raw materials are weighed according to the glass component composition in Table 1 of Example 6 and mixed uniformly;

[0084] S2, the uniformly mixed glass raw materials are placed in a kiln and heated to 1450℃ at the speed of 80℃ / h, and then melted at 1450℃ for 30min to obtain molten glass;

[0085] S3, the molten glass is clarified under the condition of nitrogen atmosphere and 1460℃ for 10h to obtain clarified glass;

[0086] S4, the clarified glass melt is stirred at the speed of 30r / min under the condition of nitrogen atmosphere and 1250℃ for 12h, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace to be annealed at 500℃ for 24h to obtain high modulus blue glass.

[0087] Example 7

[0088] A method for preparing high modulus blue glass comprises the following steps:

[0089] S1, glass raw materials are weighed according to the glass component composition in Table 1 of Example 7 and mixed uniformly;

[0090] S2, the uniformly mixed glass raw materials are placed in a kiln and heated to 1450℃ at the speed of 80℃ / h, and then melted at 1450℃ for 30min to obtain molten glass;

[0091] S3, the molten glass is clarified under the condition of nitrogen atmosphere and 1460℃ for 10h to obtain clarified glass;

[0092] S4, the clarified glass melt is stirred at the speed of 30r / min under the condition of nitrogen atmosphere and 1250℃ for 12h, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace to be annealed at 500℃ for 24h to obtain high modulus blue glass.

[0093] Comparative Example 1

[0094] A preparation method of high modulus blue glass comprises the following steps:

[0095] S1, glass raw materials are weighed according to the glass component composition in Table 1 in the comparative example 1, and mixed uniformly;

[0096] S2, the uniformly mixed glass raw materials are placed in a kiln, heated to 1450 DEG C at a speed of 80 DEG C / h, and melted at 1450 DEG C for 30 min to obtain molten glass;

[0097] S3, the molten glass is clarified at 1460 DEG C for 10 h in a nitrogen atmosphere to obtain clarified glass;

[0098] S4, the clarified glass melt is stirred at a speed of 30 r / min at 1250 DEG C for 12 h, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace, and annealed at 500 DEG C for 24 h to obtain high modulus blue glass.

[0099] Comparative example 2

[0100] A preparation method of high modulus blue glass comprises the following steps:

[0101] S1, glass raw materials are weighed according to the glass component composition in Table 1 in the comparative example 2, and mixed uniformly;

[0102] S2, the uniformly mixed glass raw materials are placed in a kiln, heated to 1450 DEG C at a speed of 80 DEG C / h, and melted at 1450 DEG C for 30 min to obtain molten glass;

[0103] S3, the molten glass is clarified at 1460 DEG C for 10 h in a nitrogen atmosphere to obtain clarified glass;

[0104] S4, the clarified glass melt is stirred at a speed of 30 r / min at 1250 DEG C for 12 h, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace, and annealed at 500 DEG C for 24 h to obtain high modulus blue glass.

[0105] Comparative example 3

[0106] A preparation method of high modulus blue glass comprises the following steps:

[0107] S1, glass raw materials are weighed according to the glass component composition in Table 1 in the comparative example 3, and mixed uniformly;

[0108] S2, the uniformly mixed glass raw materials are placed in a kiln, heated to 1450 DEG C at a speed of 80 DEG C / h, and melted at 1450 DEG C for 30 min to obtain molten glass;

[0109] S3, the molten glass is clarified under nitrogen atmosphere at 1460℃ for 10h to obtain clarified glass;

[0110] S4, the clarified glass melt is stirred at 30r / min under nitrogen atmosphere at 1250℃ for 12h, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace for annealing at 500℃ for 24h to obtain high modulus blue glass.

[0111] Comparative Example 4

[0112] A method for preparing high modulus blue glass, comprising the following steps:

[0113] S1, the glass raw materials are weighed according to the glass composition in Table 1 of Comparative Example 1, and mixed uniformly;

[0114] S2, the uniformly mixed glass raw materials are placed in a kiln and heated to 1450℃ at a rate of 80℃ / h, and melted at 1450℃ for 30min to obtain molten glass;

[0115] S3, the molten glass is clarified under nitrogen atmosphere at 1460℃ for 10h to obtain clarified glass;

[0116] S4, the clarified glass melt is stirred at 30r / min under nitrogen atmosphere at 1250℃ for 12h, then the glass melt is poured into a graphite mold and quickly moved into an annealing furnace for annealing at 500℃ for 24h to obtain high modulus blue glass.

[0117] The blue glass samples prepared in Examples 1-7 and Comparative Examples 1-4 are cut into thin slices of 35mm×22mm×1mm, and then performance tests are carried out, as follows:

[0118] Determination of microhardness: the microhardness of the samples is tested by HVS-1000 digital microhardness tester, using a Vickers diamond indenter with a load of 0.981N and a loading time of 10s, five points are taken for each sample, and the average value is taken;

[0119] Determination of flexural strength: the flexural strength of the blue glass samples is tested by the commonly used "three-point bending test method" using RGM-4100 electronic universal testing machine produced by Shenzhen Regal Instrument Co., Ltd., and the test is repeated three times, and the average value is taken;

[0120] Young's modulus: tested in accordance with the standard GB / T 7962.6-2010;

[0121] Transmittance test: the average transmittance of the glass samples at 430-565nm wavelength and the average transmittance at 725-1100nm wavelength are measured respectively, and the results are shown in Table 2.

[0122] Table 2 Test results for properties of different sets of glass samples

[0123]

[0124] Finally, it should be noted that the above examples do not limit the present application in any form. For those skilled in the art, some modifications and improvements can be made on the basis of the present application. Therefore, any modification or improvement made without departing from the spirit of the present application shall fall within the scope of the present application.

Claims

1. A high modulus blue glass for an infrared cut filter, characterized by, The high modulus blue glass comprises the following components by weight percentage: P2O5 51.1-52.8% K2O 7.2-7.7% CaO 6.3-6.8% MgO 6.1-7.1% Na2O 5.8-6.4% Al2O3 5.2-5.7% CuO 3.2-4.6% ZnO 3.0-3.8% BaO 2.4-2.9% Fluoride 5.8-6.9%; The fluoride comprises LiF, EuF3 and TbF3; The weight ratio of LiF / (EuF3+TbF3) is 2.7-4.5:

1.

2. The high modulus blue glass of claim 1, wherein, The high modulus blue glass comprises the following components by weight percentage: P2O5 51.9-52.3% K2O 7.4-7.6% CaO 6.4-6.7% MgO 6.3-6.5% Na2O 6.0-6.2% Al2O3 5.4-5.6% CuO 3.39-3.61% ZnO 3.2-3.5% BaO 2.5-2.8% Fluoride 6.1-6.6%.

3. The method of making high modulus blue glass according to any one of claims 1-2, wherein, The method comprises the following steps: mixing raw materials according to the formula, and then melting, refining, stirring and annealing to obtain the high modulus blue glass.

4. The production method according to claim 3, characterized by, The melting temperature is 1350-1450℃, and the melting time is 25-40min.

5. The preparation method according to claim 3, characterized in that, The refining temperature is 1450-1480℃, and the refining time is 8-12h.

6. The preparation method according to claim 3, characterized in that, The stirring temperature is 1200-1300℃, and the stirring time is 8-12h.

7. The preparation method according to claim 3, characterized in that, The annealing temperature is 460-560℃, and the annealing time is 18-24h.

8. The preparation method according to claim 3, characterized in that, Nitrogen is introduced to protect the furnace atmosphere during the refining and stirring processes.

9. Use of the high modulus blue glass according to any one of claims 1-2 in the preparation of an infrared cut-off filter.

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